refactor(BA-5715): drop stale misc fragments from intermediate slices

Clean up the ``changes/BA-5650-{D,E,F}.misc.md`` files that were
superseded when each slice's news fragment was renamed to the assigned
PR number (e.g. ``changes/11046.enhance.md``). These stragglers made it
onto downstream branches during the cascade rebases.

Author: jopemachine

changes/BA-5650-D.misc.md

@@ -155,8 +155,7 @@ async def _post_status_transition(
                     )
                 else:
                     log.warning(
-                        "POST_START_SESSION skipped: owner {} has no main_access_key"
-                        " (session {})",
+                        "POST_START_SESSION skipped: owner {} has no main_access_key (session {})",
                         session_row.user_uuid,
                         session_row.id,
                     )